JPS6128311A - Powdery coating agent of paddy rice seed - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a powder coating agent for rice seeds for direct sowing in flooded soil.

BACKGROUND OF THE INVENTION In recent years, direct sowing in flooded soil, which is a new method of cultivating paddy rice, is rapidly becoming popular in Japan. Instead of transplanting rice seedlings, the latter method involves sowing seeds directly into the soil at a depth of 1 to 1.5 ag, which not only greatly reduces the labor and time required to raise rice seedlings, but also reduces the need for transplanting. Since there is no mechanical damage to the plants, a 10-20% increase in sales is expected.

In the direct sowing cultivation method in flooded soil, seeds are sown at a depth of 1 to 1.5 tall from the soil surface in a flooded state, so seeds lack oxygen and smooth germination cannot be expected. As a way to overcome this problem, the special public
Publication No. 28751 (m is also a method for promoting germination of paddy rice seeds) and Japanese Patent Publication No. 55-22045 (Method for direct sowing in submerged soil) are disclosed.

That is, calcium peroxide aids in the germination of rice seeds by utilizing the property of reacting with water in the soil and gradually releasing oxygen.

Problems to be Solved by the Invention However, even with seeds treated with powder coating with calcium peroxide, germination and seedling establishment may be poor in poor environmental conditions such as strongly reduced fields or low temperatures after sowing. It is said that thoracotomy may sometimes result in no budding at all.

One way to solve these problems is to mix calcium peroxide with 3-hydroxy-5-methylinxazole (trade name: Tachigaren) and coat the seeds with the mixture, which is expected to be more effective. [Masami Ogawa et al., Agriculture and Horticulture 48.1297-15]
00 (1975)).

However, satisfactory effects cannot necessarily be obtained in all environmentally poor paddy fields.

Means for Solving the Problems The present inventors conducted intensive studies to solve the problem, and as a result, discovered a specific causal relationship caused by a specific compound, and completed the present invention. That is, the present invention provides a method for direct sowing in flooded soil containing calcium peroxide and 5-butyl-2-dimethylamino-6-methylpyrimidine-4-ohy (trade name of ICI Co., Ltd., Milcarb, hereinafter referred to as Milcarb). It is a powder coating agent for rice seeds.

Milcarb is a fungicide used only to control powdery mildew on cucumbers, melons, etc., and is not applied to paddy rice.

In carrying out the present invention, there are two methods: one method is to mix calcium peroxide and Milcarb as a dusting agent in advance and coat the seeds first, and the other is to soak the seeds in a diluted Millcarb solution before dressing, and then coat the seeds with calcium peroxide. or,
Methods such as using a diluted Milcarb solution instead of the water used when coating calcium peroxide can be used.

Furthermore, if necessary, it can be used in combination with known drugs that are known to reduce or prevent the effects of calcium peroxide, or depending on the purpose, it can be used in combination with a plant growth regulator that has a growth-promoting effect. You can also.

The mixing ratio of calcium peroxide and mill carb depends on the conditions of the paddy fields where this powder coating is sown, for example, in heavily reduced rice fields, calcium peroxide preparations (a powder coating formulation containing 35% calcium peroxide, Hodogaya Chemical Co., Ltd.) ■Trade name: Calper powder (hereinafter referred to as Calper powder) Approximately 8% of Milcarb preparation (a liquid preparation containing 12-5% of the active ingredient) is added to K, but usually cL is 2% to 8%, and more preferably cL. It is useful to add 0.5% to 3% millcarb. Since the amount used per 10 ares of Calper powder is about 3 to 4, the addition of 2% Milcarb to Calper powder is calculated to be only about 10 f as an active ingredient per 10 ares.

Effects of the Invention It is surprising that such a very small amount of K mill carb brings about a very remarkable improvement in the rate of germination and seedling establishment in paddy fields with poor environmental conditions. On the other hand, the reason why the basic rules contribute to good growth is currently unknown. For example, it prevents Milcarb or its metabolites from reducing the effectiveness of calcium peroxide by microorganisms. Microorganisms that grow under flooded conditions in the presence of calcium peroxide, which cause problems in rice budding and seedling establishment under poor environmental conditions, are eliminated by Milcarb or its metabolites, or they grow to the extent that they do not cause any problems. to prevent It is conceivable that Milcarb and its metabolites absorbed into paddy rice seeds or seedlings after emergence confer resistance to external growth-inhibiting factors to paddy rice seedlings under poor environmental conditions.

The usefulness of the present invention will be explained below by showing test examples.

Test Example 1 In nutrient-rich soil, 3% of Tachigaren 4% powder and 1% of Milcarb 12.5% solution were added to Calper powder in an amount equal to the dry weight of paddy, as shown in Table 1. , 2% and 4% were mixed, and the rice seeds (variety: Nipponbare) were coated in powder using the usual method.

Paddy soil with 20 flour-coated seeds submerged under water @500
After mixing 1r of PK chemical fertilizer (containing 8% each of N, P, and K) to create a rich nutrient condition, the seeds were sown at a position 1,561+ below the soil surface layer. After sowing, the water was flooded to a depth of 50 m, and the temperature was maintained at 25°C during the day.
The seeds were placed in a biotron at night at 20°C (12 hours each), and the number of sprouts was examined over time.

The test was conducted twice, and the results are shown in the table below as an average value.

Table - Test Example 2 Test on reduced soil 250 fK of air-dried paddy soil, 1 f of glucose, and twice the amount of water as the soil were added, thoroughly mixed, and kept at an average temperature of 23° C. for 2 weeks to prepare reduced soil.

Paddy rice seeds (variety Koshihikari ) 20 grains each, 1.
Seeds are sown at 5 (to), flooding depth is 3 (to), daytime is 25
℃, and maintained in a biotron at 25°C at night (12 hours each). The average number of sprouts is shown in the table below.

As is clear from the above test examples in Table 2, a significant increase in the number of germination was observed in all seeds coated with Millcarb added to Calper powder. In other words, it is clear that the agent of the present invention prevents the effect of Calper powder from diminishing under both conditions, including artificially enriched soil and strong reduction prepared by mixing glucose into the soil. be.

Test Example 3 Tachigaren 4% powder was applied to test rice seeds (variety: Sasanishiki) in a field in Kashimadai-cho, Miyagi Prefecture.
An amount of Calper powder mixed with a predetermined amount of Millcarb 12.5% liquid was used in an amount equal to the weight of the dry rice, and the rice was coated in powder according to a conventional method.

The seeds coated as described above were sown at a rate of 7 parts per 10 ares in a portion of about 1 cs below the soil surface of a paddy field flooded on May 7th, and then submerged in water to a depth of about 3 plows.

At the fourth interval after sowing, the seedling establishment rate and plant height were investigated.

The exam is 6rr? The test was carried out three times per section, and the average soil temperature during this period was 11 to 17°C. The average values of the results are shown in Table 3.

Table 3 Test results of additive drugs in Kashimadai Town, Miyagi Prefecture
Content rate Seedling establishment rate Plant height test example 4 Test in a field in Takanezawa-cho, Tochimoto Prefecture Similarly to test example 3, Tachigaren 4% powder and Milcarb 12.5 were added to Calper powder, respectively.
% of the liquid preparation was mixed, and paddy rice seeds (variety - Tsubosi) were mixed.
Vc coated. Sow flour-coated seeds at a ratio of 7 parts per 10 ares according to May 15th test example 5, and control the growth.
After 4 weeks, the seedling establishment rate and plant height were investigated. The average temperature during this period was 11-16°C, and the average soil temperature was 15-22°C.

The average value of the results is shown in the fourth page.

Table 4: Test additives tested in Takanezawa-cho, Tochigi Prefecture Content rate Seedling establishment rate Plant height As is clear from Tables 3 and 4, the present agent had a significant seedling establishment rate even under Ins conditions.
It showed an improvement in plant height.

Example Examples are shown below.

Example 1 50 parts by weight of a mixture of 98 parts by weight of Carba powder and 2 parts by weight or more of Millcarb 12.5% liquid were added to an equal amount of specific gravity 1 per dry powder weight.
．． Thirteen brine-sorted paddy rice seeds were coated with water.

Hodogaya Chemical Industry Co., Ltd.

Claims (1)

[Claims] Rice seed dusting agent for direct sowing in flooded soil containing calcium peroxide and 5-butyl-2-dimethylamino-6-methylpyrimidin-4-ol